The "Publius Enigma" or "Enigma Publius" connected with "Pink Floyd" may possibly be another thing linked with the "Pope(s)"/[Emperors]. Since this is an ebook it is easier to refer people to the wikipedia article for introductory information on the Publius Enigma. https://en.wikipedia.org/wiki/Publius_Enigma
The Pubius Enigma seems to be connected with one of the following 8 [+ 1] people/groups (Romans/Catholics, Corporates, Masons, Nazis/Aryans/Germans, Satanists, drugs, Jews, Americans, [Poe]). (The 2 [or 3] strongest matches are the Romans, and the Americans, [or Aryans?])
(Below, the lines under each of the 8 headers are possible equations: The first words in double speech marks / quote marks are Publius Enigma-related words/names/phrases mentioned in articles; the next words/names/things are our very tentative possible candidate connections.)
"Enigma" = Nimrod the 9th of Elgar's Enigma Variations (1899).
"Publius" = a Roman name. ("Throughout Roman history, Publius was one of the most frequently-used praenomina"; "is generally regarded as a quintessentially Latin praenomen".) (Publius Licinius Crassus. St Publius 1st bishop of Malta. Publius Virgil. Publius T Varro. Publius S Geta. Publius Papinius Statius. Publius Ovid. Emp Publius L Valerian. Emp Publius L E Gallienus. Publius H Pertinax. Publius C Tacitus. Emp Publius A Hadrian. Publius V Publicola 503 bc.)
Publius Enigma ~ Public Enemy (Nero Caesar)? (Public Trust?)
["Publius" first made me think of Paul/Pablo & Plebian & Publican/republic/populism? & secondly Pope & Pius? & thridly pueblo & pluri "many".]